A radiation image processing apparatus which improves contrast and sharpness of radiation images is provided. According to this radiation image processing apparatus, comparison is made between a first image data obtained by radiation imaging without going through the subject but through a grid for removing scattered radiation from a subject, and a second image data which is obtained by radiation imaging through the subject and the grid, and a two-dimensional distribution of abundance of scattered component is calculated. Using this two-dimensional distribution of scattered component, abundance of scattered radiation is locally determined at each position, and a sharpening process is performed with sharpening intensities that are increased in response to abundance of scattered radiation.
Legal claims defining the scope of protection, as filed with the USPTO.
1. An X-ray radioscopy apparatus having a grid on a front surface of a radiation detection unit for eliminating radiation from a subject, said apparatus comprising: a first extraction unit configured to extract a first grid image component arising from said grid in a first image data obtained from radiation imaging without passing through the subject; a second extraction unit configured to extract a second grid image component arising from said grid in a second image data obtained from radiation imaging through the subject; a calculation unit configured to calculate abundance of scattered component as a scalar value by comparing said first grid image component and said second grid image component; and a determination unit configured to determine an X-ray irradiation condition to reduce said scalar value calculated by said calculation unit.
2. The X-ray radioscopy apparatus according to claim 1 , further comprising a storage unit configured to store an equivalence curve data table of irradiated X-ray amount related to X-ray irradiation condition, wherein said calculation unit obtains X-ray images by radiation imaging under a plurality of X-ray irradiation conditions that exist on the equivalence curve from said equivalence curve data table, and calculates said scalar values for each, and wherein said determination unit selects the X-ray irradiation condition which has the smallest scalar value among scalar values calculated by said calculation unit.
3. A method of controlling an X-ray radioscopy apparatus having a grid on a front surface of a radiation detection unit for eliminating radiation from a subject, comprising steps of: extracting a first grid image component arising from the grid in a first image data obtained from radiation imaging without passing through the subject; extracting a second grid image component arising from the grid in a second image data obtained from radiation imaging through the subject; calculating abundance of scattered component as a scalar value by comparing the first grid image component and the second grid image component; and determining an X-ray irradiation condition to reduce the scalar value calculated in said calculation step.
4. A non-transitory computer-readable medium storing, in executable form, a computer program for controlling an X-ray radioscopy apparatus having a grid on a front surface of a radiation detection unit for eliminating radiation from a subject, the program comprising code for performing the following steps: extracting a first grid image component arising from the grid in a first image data obtained from radiation imaging without passing through the subject; extracting a second grid image component arising from the grid in a second image data obtained from radiation imaging through the subject; calculating abundance of scattered component as a scalar value by comparing the first grid image component and the second grid image component; and determining an X-ray irradiation condition to reduce the scalar value calculated in said calculation step.
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October 16, 2009
March 5, 2013
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